It happens every year, and can last several weeks. It happens about now or slightly earlier (mine always seem to moult late for reasons unbeknownst to me). All area are moulted, and they can sometimes end up looking rather bare!

You are seeing juvie feathers replaced with adult feathers. I guarantee you arent seeing the first true molt. They go through several feather stages before the 18 month molt and that's what you're seeing.